Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
thanh cac » hanh cac, thanh bac, tranh cac
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
thanh ca » thanh cha, thanh ha, thanh va
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang cao hoi. hieu van ((lam duoc) or (nam thuoc)) ma ((thanh ca) OR (thanh cac)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang cao hoi. hieu van ((lam duoc) OR (nam thuoc)) ma ((thanh ca) OR (thanh cac)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang cao hoi. hieu van ((lam duoc) or (nam thuoc)) ma ((thanh ca) OR (thanh cac)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. hieu van ((lam duoc) or (nam thuoc)) ma ((thanh ca) OR (thanh cac)) cua tre*.